Stopwatch not working.

[Pojahn_M]

I have created a stop watch, and it is not working.

The stop watch format is hh:mm:ss:mm
However, it always display as 0:0:0:1 no matter how long it is active.

package clock.core;

enum Direction
{
	POSETIVE,
	NEGATIVE;
}

public class Clock 
{
	public static void main (String... args) throws InterruptedException
	{
		Clock c = new Clock();
		c.start();
		Thread.sleep(25);
		c.stop();
		System.out.println(c.toString());
	}
	
	private int hour,minute,second,milli;
	private boolean running, posetive, stop;
	private Direction direction;
	private Thread clock;
	private TimerThread counterThread;
	private transient int debugCounter = 0;
	
	public Clock () {}

	public void start ()
	{
		if (running)
			throw new IllegalStateException ("Can not start a clock that is already running.");
		
		init ();		
		clock = new Thread ()
		{
			@Override
			public void run ()
			{
				int currentTime = 0;
				counterThread = new TimerThread (Clock.this);
				counterThread.start();
				
				while (!stop)
				{
					if (counterThread.millisecond <= currentTime)
						continue;
					else
						currentTime = counterThread.millisecond;
					
					if (posetive && direction == Direction.POSETIVE ||
					   !posetive && direction == Direction.NEGATIVE)
						increment ();
					else if (posetive && direction == Direction.NEGATIVE)
					{
						decrement ();
						if (hour == 0 && minute == 0 && second == 0 && milli == 0)
							posetive = false;
					}
					else if (!posetive && direction == Direction.POSETIVE)
					{
						decrement ();
						if (hour == 0 && minute == 0 && second == 0 && milli == 0)
							posetive = true;
					}
				}				
			}
		};
		clock.start();
		running = true;
	}
	
	public void stop ()
	{
		stop = true;
		running = false;
	}
	
	public void shift ()
	{
		direction = (direction == Direction.POSETIVE) ? Direction.NEGATIVE : Direction.POSETIVE;
	}
	
	@Override
	public String toString ()
	{
		StringBuilder time = new StringBuilder (13);
		if (!posetive)
			time.append("-");
		time.append(hour).append(":").append(minute).append(":").append(second).append(":").append(milli);
		return time.toString();
	}
	
	private void increment ()
	{
		if (++milli == 999)
		{
			milli = 0;
			if (++second == 59 )
			{
				second = 0;
				if (++minute > 59)
				{
					minute = 0;
					hour++;
				}
			}
		}
	}
	
	private void decrement ()
	{
		if (--milli == 0)
		{
			milli = 999;
			if (--second == 0)
			{
				second = 59;
				if (--minute == 0)
				{
					minute = 59;
					hour--;
				}
			}
		}
	}
	
	private void init ()
	{
		hour   = 0; 
		minute = 0; 
		second = 0; 
		milli  = 0;
		running = false;
		posetive = true;
		stop = false;
		direction = Direction.POSETIVE;
	}
	
	private static class TimerThread extends Thread
	{
		int millisecond;
		Clock clock;
		
		TimerThread (Clock clock) 
		{
			this.clock = clock;
			millisecond = 0;
		}

		@Override
		public void run () 
		{
			try 
			{
				Thread.sleep(1);
			} 
			catch (InterruptedException e) {}
			millisecond++;
			
			if (clock.stop)
				return;
		}		
	}
}

I have added a system.out.println debug at line:50, and it seems like the code is only executed once.
I cant figure it out. Some help?

[DarrylBurke]

Not an advanced topic. Moving to New to Java

db